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TOMOYO Linux Cross Reference
Linux/fs/nfs/internal.h

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  1 /*
  2  * NFS internal definitions
  3  */
  4 
  5 #include "nfs4_fs.h"
  6 #include <linux/mount.h>
  7 #include <linux/security.h>
  8 
  9 #define NFS_MS_MASK (MS_RDONLY|MS_NOSUID|MS_NODEV|MS_NOEXEC|MS_SYNCHRONOUS)
 10 
 11 struct nfs_string;
 12 
 13 /* Maximum number of readahead requests
 14  * FIXME: this should really be a sysctl so that users may tune it to suit
 15  *        their needs. People that do NFS over a slow network, might for
 16  *        instance want to reduce it to something closer to 1 for improved
 17  *        interactive response.
 18  */
 19 #define NFS_MAX_READAHEAD       (RPC_DEF_SLOT_TABLE - 1)
 20 
 21 static inline void nfs_attr_check_mountpoint(struct super_block *parent, struct nfs_fattr *fattr)
 22 {
 23         if (!nfs_fsid_equal(&NFS_SB(parent)->fsid, &fattr->fsid))
 24                 fattr->valid |= NFS_ATTR_FATTR_MOUNTPOINT;
 25 }
 26 
 27 static inline int nfs_attr_use_mounted_on_fileid(struct nfs_fattr *fattr)
 28 {
 29         if (((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) == 0) ||
 30             (((fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT) == 0) &&
 31              ((fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) == 0)))
 32                 return 0;
 33 
 34         fattr->fileid = fattr->mounted_on_fileid;
 35         return 1;
 36 }
 37 
 38 struct nfs_clone_mount {
 39         const struct super_block *sb;
 40         const struct dentry *dentry;
 41         struct nfs_fh *fh;
 42         struct nfs_fattr *fattr;
 43         char *hostname;
 44         char *mnt_path;
 45         struct sockaddr *addr;
 46         size_t addrlen;
 47         rpc_authflavor_t authflavor;
 48 };
 49 
 50 /*
 51  * Note: RFC 1813 doesn't limit the number of auth flavors that
 52  * a server can return, so make something up.
 53  */
 54 #define NFS_MAX_SECFLAVORS      (12)
 55 
 56 /*
 57  * Value used if the user did not specify a port value.
 58  */
 59 #define NFS_UNSPEC_PORT         (-1)
 60 
 61 /*
 62  * Maximum number of pages that readdir can use for creating
 63  * a vmapped array of pages.
 64  */
 65 #define NFS_MAX_READDIR_PAGES 8
 66 
 67 struct nfs_client_initdata {
 68         unsigned long init_flags;
 69         const char *hostname;
 70         const struct sockaddr *addr;
 71         size_t addrlen;
 72         struct nfs_subversion *nfs_mod;
 73         int proto;
 74         u32 minorversion;
 75         struct net *net;
 76 };
 77 
 78 /*
 79  * In-kernel mount arguments
 80  */
 81 struct nfs_parsed_mount_data {
 82         int                     flags;
 83         unsigned int            rsize, wsize;
 84         unsigned int            timeo, retrans;
 85         unsigned int            acregmin, acregmax,
 86                                 acdirmin, acdirmax;
 87         unsigned int            namlen;
 88         unsigned int            options;
 89         unsigned int            bsize;
 90         unsigned int            auth_flavor_len;
 91         rpc_authflavor_t        auth_flavors[1];
 92         char                    *client_address;
 93         unsigned int            version;
 94         unsigned int            minorversion;
 95         char                    *fscache_uniq;
 96         bool                    need_mount;
 97 
 98         struct {
 99                 struct sockaddr_storage address;
100                 size_t                  addrlen;
101                 char                    *hostname;
102                 u32                     version;
103                 int                     port;
104                 unsigned short          protocol;
105         } mount_server;
106 
107         struct {
108                 struct sockaddr_storage address;
109                 size_t                  addrlen;
110                 char                    *hostname;
111                 char                    *export_path;
112                 int                     port;
113                 unsigned short          protocol;
114         } nfs_server;
115 
116         struct security_mnt_opts lsm_opts;
117         struct net              *net;
118 };
119 
120 /* mount_clnt.c */
121 struct nfs_mount_request {
122         struct sockaddr         *sap;
123         size_t                  salen;
124         char                    *hostname;
125         char                    *dirpath;
126         u32                     version;
127         unsigned short          protocol;
128         struct nfs_fh           *fh;
129         int                     noresvport;
130         unsigned int            *auth_flav_len;
131         rpc_authflavor_t        *auth_flavs;
132         struct net              *net;
133 };
134 
135 struct nfs_mount_info {
136         void (*fill_super)(struct super_block *, struct nfs_mount_info *);
137         int (*set_security)(struct super_block *, struct dentry *, struct nfs_mount_info *);
138         struct nfs_parsed_mount_data *parsed;
139         struct nfs_clone_mount *cloned;
140         struct nfs_fh *mntfh;
141 };
142 
143 extern int nfs_mount(struct nfs_mount_request *info);
144 extern void nfs_umount(const struct nfs_mount_request *info);
145 
146 /* client.c */
147 extern const struct rpc_program nfs_program;
148 extern void nfs_clients_init(struct net *net);
149 extern struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *);
150 int nfs_create_rpc_client(struct nfs_client *, const struct rpc_timeout *, rpc_authflavor_t);
151 struct nfs_client *nfs_get_client(const struct nfs_client_initdata *,
152                                   const struct rpc_timeout *, const char *,
153                                   rpc_authflavor_t);
154 int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *, struct nfs_fattr *);
155 void nfs_server_insert_lists(struct nfs_server *);
156 void nfs_init_timeout_values(struct rpc_timeout *, int, unsigned int, unsigned int);
157 int nfs_init_server_rpcclient(struct nfs_server *, const struct rpc_timeout *t,
158                 rpc_authflavor_t);
159 struct nfs_server *nfs_alloc_server(void);
160 void nfs_server_copy_userdata(struct nfs_server *, struct nfs_server *);
161 
162 extern void nfs_cleanup_cb_ident_idr(struct net *);
163 extern void nfs_put_client(struct nfs_client *);
164 extern void nfs_free_client(struct nfs_client *);
165 extern struct nfs_client *nfs4_find_client_ident(struct net *, int);
166 extern struct nfs_client *
167 nfs4_find_client_sessionid(struct net *, const struct sockaddr *,
168                                 struct nfs4_sessionid *, u32);
169 extern struct nfs_server *nfs_create_server(struct nfs_mount_info *,
170                                         struct nfs_subversion *);
171 extern struct nfs_server *nfs4_create_server(
172                                         struct nfs_mount_info *,
173                                         struct nfs_subversion *);
174 extern struct nfs_server *nfs4_create_referral_server(struct nfs_clone_mount *,
175                                                       struct nfs_fh *);
176 extern void nfs_free_server(struct nfs_server *server);
177 extern struct nfs_server *nfs_clone_server(struct nfs_server *,
178                                            struct nfs_fh *,
179                                            struct nfs_fattr *,
180                                            rpc_authflavor_t);
181 extern int nfs_wait_client_init_complete(const struct nfs_client *clp);
182 extern void nfs_mark_client_ready(struct nfs_client *clp, int state);
183 extern struct nfs_client *nfs4_set_ds_client(struct nfs_client* mds_clp,
184                                              const struct sockaddr *ds_addr,
185                                              int ds_addrlen, int ds_proto,
186                                              unsigned int ds_timeo,
187                                              unsigned int ds_retrans);
188 #ifdef CONFIG_PROC_FS
189 extern int __init nfs_fs_proc_init(void);
190 extern void nfs_fs_proc_exit(void);
191 #else
192 static inline int nfs_fs_proc_init(void)
193 {
194         return 0;
195 }
196 static inline void nfs_fs_proc_exit(void)
197 {
198 }
199 #endif
200 
201 #ifdef CONFIG_NFS_V4_1
202 int nfs_sockaddr_match_ipaddr(const struct sockaddr *, const struct sockaddr *);
203 #endif
204 
205 /* nfs3client.c */
206 #if IS_ENABLED(CONFIG_NFS_V3)
207 struct nfs_server *nfs3_create_server(struct nfs_mount_info *, struct nfs_subversion *);
208 struct nfs_server *nfs3_clone_server(struct nfs_server *, struct nfs_fh *,
209                                      struct nfs_fattr *, rpc_authflavor_t);
210 #endif
211 
212 /* callback_xdr.c */
213 extern struct svc_version nfs4_callback_version1;
214 extern struct svc_version nfs4_callback_version4;
215 
216 struct nfs_pageio_descriptor;
217 /* pagelist.c */
218 extern int __init nfs_init_nfspagecache(void);
219 extern void nfs_destroy_nfspagecache(void);
220 extern int __init nfs_init_readpagecache(void);
221 extern void nfs_destroy_readpagecache(void);
222 extern int __init nfs_init_writepagecache(void);
223 extern void nfs_destroy_writepagecache(void);
224 
225 extern int __init nfs_init_directcache(void);
226 extern void nfs_destroy_directcache(void);
227 extern bool nfs_pgarray_set(struct nfs_page_array *p, unsigned int pagecount);
228 extern void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
229                               struct nfs_pgio_header *hdr,
230                               void (*release)(struct nfs_pgio_header *hdr));
231 void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos);
232 int nfs_iocounter_wait(struct nfs_io_counter *c);
233 
234 static inline void nfs_iocounter_init(struct nfs_io_counter *c)
235 {
236         c->flags = 0;
237         atomic_set(&c->io_count, 0);
238 }
239 
240 /* nfs2xdr.c */
241 extern struct rpc_procinfo nfs_procedures[];
242 extern int nfs2_decode_dirent(struct xdr_stream *,
243                                 struct nfs_entry *, int);
244 
245 /* nfs3xdr.c */
246 extern struct rpc_procinfo nfs3_procedures[];
247 extern int nfs3_decode_dirent(struct xdr_stream *,
248                                 struct nfs_entry *, int);
249 
250 /* nfs4xdr.c */
251 #if IS_ENABLED(CONFIG_NFS_V4)
252 extern int nfs4_decode_dirent(struct xdr_stream *,
253                                 struct nfs_entry *, int);
254 #endif
255 #ifdef CONFIG_NFS_V4_1
256 extern const u32 nfs41_maxread_overhead;
257 extern const u32 nfs41_maxwrite_overhead;
258 extern const u32 nfs41_maxgetdevinfo_overhead;
259 #endif
260 
261 /* nfs4proc.c */
262 #if IS_ENABLED(CONFIG_NFS_V4)
263 extern struct rpc_procinfo nfs4_procedures[];
264 #endif
265 
266 /* proc.c */
267 void nfs_close_context(struct nfs_open_context *ctx, int is_sync);
268 extern struct nfs_client *nfs_init_client(struct nfs_client *clp,
269                            const struct rpc_timeout *timeparms,
270                            const char *ip_addr, rpc_authflavor_t authflavour);
271 
272 /* dir.c */
273 extern int nfs_access_cache_shrinker(struct shrinker *shrink,
274                                         struct shrink_control *sc);
275 struct dentry *nfs_lookup(struct inode *, struct dentry *, unsigned int);
276 int nfs_create(struct inode *, struct dentry *, umode_t, bool);
277 int nfs_mkdir(struct inode *, struct dentry *, umode_t);
278 int nfs_rmdir(struct inode *, struct dentry *);
279 int nfs_unlink(struct inode *, struct dentry *);
280 int nfs_symlink(struct inode *, struct dentry *, const char *);
281 int nfs_link(struct dentry *, struct inode *, struct dentry *);
282 int nfs_mknod(struct inode *, struct dentry *, umode_t, dev_t);
283 int nfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *);
284 
285 /* file.c */
286 int nfs_file_fsync_commit(struct file *, loff_t, loff_t, int);
287 loff_t nfs_file_llseek(struct file *, loff_t, int);
288 int nfs_file_flush(struct file *, fl_owner_t);
289 ssize_t nfs_file_read(struct kiocb *, const struct iovec *, unsigned long, loff_t);
290 ssize_t nfs_file_splice_read(struct file *, loff_t *, struct pipe_inode_info *,
291                              size_t, unsigned int);
292 int nfs_file_mmap(struct file *, struct vm_area_struct *);
293 ssize_t nfs_file_write(struct kiocb *, const struct iovec *, unsigned long, loff_t);
294 int nfs_file_release(struct inode *, struct file *);
295 int nfs_lock(struct file *, int, struct file_lock *);
296 int nfs_flock(struct file *, int, struct file_lock *);
297 ssize_t nfs_file_splice_write(struct pipe_inode_info *, struct file *, loff_t *,
298                               size_t, unsigned int);
299 int nfs_check_flags(int);
300 int nfs_setlease(struct file *, long, struct file_lock **);
301 
302 /* inode.c */
303 extern struct workqueue_struct *nfsiod_workqueue;
304 extern struct inode *nfs_alloc_inode(struct super_block *sb);
305 extern void nfs_destroy_inode(struct inode *);
306 extern int nfs_write_inode(struct inode *, struct writeback_control *);
307 extern int nfs_drop_inode(struct inode *);
308 extern void nfs_clear_inode(struct inode *);
309 extern void nfs_evict_inode(struct inode *);
310 void nfs_zap_acl_cache(struct inode *inode);
311 extern int nfs_wait_bit_killable(void *word);
312 
313 /* super.c */
314 extern const struct super_operations nfs_sops;
315 extern struct file_system_type nfs_fs_type;
316 extern struct file_system_type nfs_xdev_fs_type;
317 #if IS_ENABLED(CONFIG_NFS_V4)
318 extern struct file_system_type nfs4_xdev_fs_type;
319 extern struct file_system_type nfs4_referral_fs_type;
320 #endif
321 struct dentry *nfs_try_mount(int, const char *, struct nfs_mount_info *,
322                         struct nfs_subversion *);
323 void nfs_initialise_sb(struct super_block *);
324 int nfs_set_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
325 int nfs_clone_sb_security(struct super_block *, struct dentry *, struct nfs_mount_info *);
326 struct dentry *nfs_fs_mount_common(struct nfs_server *, int, const char *,
327                                    struct nfs_mount_info *, struct nfs_subversion *);
328 struct dentry *nfs_fs_mount(struct file_system_type *, int, const char *, void *);
329 struct dentry * nfs_xdev_mount_common(struct file_system_type *, int,
330                 const char *, struct nfs_mount_info *);
331 void nfs_kill_super(struct super_block *);
332 void nfs_fill_super(struct super_block *, struct nfs_mount_info *);
333 
334 extern struct rpc_stat nfs_rpcstat;
335 
336 extern int __init register_nfs_fs(void);
337 extern void __exit unregister_nfs_fs(void);
338 extern void nfs_sb_active(struct super_block *sb);
339 extern void nfs_sb_deactive(struct super_block *sb);
340 
341 /* namespace.c */
342 #define NFS_PATH_CANONICAL 1
343 extern char *nfs_path(char **p, struct dentry *dentry,
344                       char *buffer, ssize_t buflen, unsigned flags);
345 extern struct vfsmount *nfs_d_automount(struct path *path);
346 struct vfsmount *nfs_submount(struct nfs_server *, struct dentry *,
347                               struct nfs_fh *, struct nfs_fattr *);
348 struct vfsmount *nfs_do_submount(struct dentry *, struct nfs_fh *,
349                                  struct nfs_fattr *, rpc_authflavor_t);
350 
351 /* getroot.c */
352 extern struct dentry *nfs_get_root(struct super_block *, struct nfs_fh *,
353                                    const char *);
354 #if IS_ENABLED(CONFIG_NFS_V4)
355 extern struct dentry *nfs4_get_root(struct super_block *, struct nfs_fh *,
356                                     const char *);
357 
358 extern int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh);
359 #endif
360 
361 struct nfs_pgio_completion_ops;
362 /* read.c */
363 extern struct nfs_read_header *nfs_readhdr_alloc(void);
364 extern void nfs_readhdr_free(struct nfs_pgio_header *hdr);
365 extern void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
366                         struct inode *inode,
367                         const struct nfs_pgio_completion_ops *compl_ops);
368 extern int nfs_initiate_read(struct rpc_clnt *clnt,
369                              struct nfs_read_data *data,
370                              const struct rpc_call_ops *call_ops, int flags);
371 extern void nfs_read_prepare(struct rpc_task *task, void *calldata);
372 extern int nfs_generic_pagein(struct nfs_pageio_descriptor *desc,
373                               struct nfs_pgio_header *hdr);
374 extern void nfs_pageio_reset_read_mds(struct nfs_pageio_descriptor *pgio);
375 extern void nfs_readdata_release(struct nfs_read_data *rdata);
376 
377 /* super.c */
378 void nfs_clone_super(struct super_block *, struct nfs_mount_info *);
379 void nfs_umount_begin(struct super_block *);
380 int  nfs_statfs(struct dentry *, struct kstatfs *);
381 int  nfs_show_options(struct seq_file *, struct dentry *);
382 int  nfs_show_devname(struct seq_file *, struct dentry *);
383 int  nfs_show_path(struct seq_file *, struct dentry *);
384 int  nfs_show_stats(struct seq_file *, struct dentry *);
385 void nfs_put_super(struct super_block *);
386 int nfs_remount(struct super_block *sb, int *flags, char *raw_data);
387 
388 /* write.c */
389 extern void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
390                         struct inode *inode, int ioflags,
391                         const struct nfs_pgio_completion_ops *compl_ops);
392 extern struct nfs_write_header *nfs_writehdr_alloc(void);
393 extern void nfs_writehdr_free(struct nfs_pgio_header *hdr);
394 extern int nfs_generic_flush(struct nfs_pageio_descriptor *desc,
395                              struct nfs_pgio_header *hdr);
396 extern void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio);
397 extern void nfs_writedata_release(struct nfs_write_data *wdata);
398 extern void nfs_commit_free(struct nfs_commit_data *p);
399 extern int nfs_initiate_write(struct rpc_clnt *clnt,
400                               struct nfs_write_data *data,
401                               const struct rpc_call_ops *call_ops,
402                               int how, int flags);
403 extern void nfs_write_prepare(struct rpc_task *task, void *calldata);
404 extern void nfs_commit_prepare(struct rpc_task *task, void *calldata);
405 extern int nfs_initiate_commit(struct rpc_clnt *clnt,
406                                struct nfs_commit_data *data,
407                                const struct rpc_call_ops *call_ops,
408                                int how, int flags);
409 extern void nfs_init_commit(struct nfs_commit_data *data,
410                             struct list_head *head,
411                             struct pnfs_layout_segment *lseg,
412                             struct nfs_commit_info *cinfo);
413 int nfs_scan_commit_list(struct list_head *src, struct list_head *dst,
414                          struct nfs_commit_info *cinfo, int max);
415 int nfs_scan_commit(struct inode *inode, struct list_head *dst,
416                     struct nfs_commit_info *cinfo);
417 void nfs_mark_request_commit(struct nfs_page *req,
418                              struct pnfs_layout_segment *lseg,
419                              struct nfs_commit_info *cinfo);
420 int nfs_generic_commit_list(struct inode *inode, struct list_head *head,
421                             int how, struct nfs_commit_info *cinfo);
422 void nfs_retry_commit(struct list_head *page_list,
423                       struct pnfs_layout_segment *lseg,
424                       struct nfs_commit_info *cinfo);
425 void nfs_commitdata_release(struct nfs_commit_data *data);
426 void nfs_request_add_commit_list(struct nfs_page *req, struct list_head *dst,
427                                  struct nfs_commit_info *cinfo);
428 void nfs_request_remove_commit_list(struct nfs_page *req,
429                                     struct nfs_commit_info *cinfo);
430 void nfs_init_cinfo(struct nfs_commit_info *cinfo,
431                     struct inode *inode,
432                     struct nfs_direct_req *dreq);
433 
434 #ifdef CONFIG_MIGRATION
435 extern int nfs_migrate_page(struct address_space *,
436                 struct page *, struct page *, enum migrate_mode);
437 #else
438 #define nfs_migrate_page NULL
439 #endif
440 
441 /* direct.c */
442 void nfs_init_cinfo_from_dreq(struct nfs_commit_info *cinfo,
443                               struct nfs_direct_req *dreq);
444 static inline void nfs_inode_dio_wait(struct inode *inode)
445 {
446         inode_dio_wait(inode);
447 }
448 extern ssize_t nfs_dreq_bytes_left(struct nfs_direct_req *dreq);
449 
450 /* nfs4proc.c */
451 extern void __nfs4_read_done_cb(struct nfs_read_data *);
452 extern struct nfs_client *nfs4_init_client(struct nfs_client *clp,
453                             const struct rpc_timeout *timeparms,
454                             const char *ip_addr,
455                             rpc_authflavor_t authflavour);
456 extern int nfs40_walk_client_list(struct nfs_client *clp,
457                                 struct nfs_client **result,
458                                 struct rpc_cred *cred);
459 extern int nfs41_walk_client_list(struct nfs_client *clp,
460                                 struct nfs_client **result,
461                                 struct rpc_cred *cred);
462 
463 /*
464  * Determine the device name as a string
465  */
466 static inline char *nfs_devname(struct dentry *dentry,
467                                 char *buffer, ssize_t buflen)
468 {
469         char *dummy;
470         return nfs_path(&dummy, dentry, buffer, buflen, NFS_PATH_CANONICAL);
471 }
472 
473 /*
474  * Determine the actual block size (and log2 thereof)
475  */
476 static inline
477 unsigned long nfs_block_bits(unsigned long bsize, unsigned char *nrbitsp)
478 {
479         /* make sure blocksize is a power of two */
480         if ((bsize & (bsize - 1)) || nrbitsp) {
481                 unsigned char   nrbits;
482 
483                 for (nrbits = 31; nrbits && !(bsize & (1 << nrbits)); nrbits--)
484                         ;
485                 bsize = 1 << nrbits;
486                 if (nrbitsp)
487                         *nrbitsp = nrbits;
488         }
489 
490         return bsize;
491 }
492 
493 /*
494  * Calculate the number of 512byte blocks used.
495  */
496 static inline blkcnt_t nfs_calc_block_size(u64 tsize)
497 {
498         blkcnt_t used = (tsize + 511) >> 9;
499         return (used > ULONG_MAX) ? ULONG_MAX : used;
500 }
501 
502 /*
503  * Compute and set NFS server blocksize
504  */
505 static inline
506 unsigned long nfs_block_size(unsigned long bsize, unsigned char *nrbitsp)
507 {
508         if (bsize < NFS_MIN_FILE_IO_SIZE)
509                 bsize = NFS_DEF_FILE_IO_SIZE;
510         else if (bsize >= NFS_MAX_FILE_IO_SIZE)
511                 bsize = NFS_MAX_FILE_IO_SIZE;
512 
513         return nfs_block_bits(bsize, nrbitsp);
514 }
515 
516 /*
517  * Determine the maximum file size for a superblock
518  */
519 static inline
520 void nfs_super_set_maxbytes(struct super_block *sb, __u64 maxfilesize)
521 {
522         sb->s_maxbytes = (loff_t)maxfilesize;
523         if (sb->s_maxbytes > MAX_LFS_FILESIZE || sb->s_maxbytes <= 0)
524                 sb->s_maxbytes = MAX_LFS_FILESIZE;
525 }
526 
527 /*
528  * Determine the number of bytes of data the page contains
529  */
530 static inline
531 unsigned int nfs_page_length(struct page *page)
532 {
533         loff_t i_size = i_size_read(page_file_mapping(page)->host);
534 
535         if (i_size > 0) {
536                 pgoff_t page_index = page_file_index(page);
537                 pgoff_t end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
538                 if (page_index < end_index)
539                         return PAGE_CACHE_SIZE;
540                 if (page_index == end_index)
541                         return ((i_size - 1) & ~PAGE_CACHE_MASK) + 1;
542         }
543         return 0;
544 }
545 
546 /*
547  * Convert a umode to a dirent->d_type
548  */
549 static inline
550 unsigned char nfs_umode_to_dtype(umode_t mode)
551 {
552         return (mode >> 12) & 15;
553 }
554 
555 /*
556  * Determine the number of pages in an array of length 'len' and
557  * with a base offset of 'base'
558  */
559 static inline
560 unsigned int nfs_page_array_len(unsigned int base, size_t len)
561 {
562         return ((unsigned long)len + (unsigned long)base +
563                 PAGE_SIZE - 1) >> PAGE_SHIFT;
564 }
565 
566 /*
567  * Convert a struct timespec into a 64-bit change attribute
568  *
569  * This does approximately the same thing as timespec_to_ns(),
570  * but for calculation efficiency, we multiply the seconds by
571  * 1024*1024*1024.
572  */
573 static inline
574 u64 nfs_timespec_to_change_attr(const struct timespec *ts)
575 {
576         return ((u64)ts->tv_sec << 30) + ts->tv_nsec;
577 }
578 

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